@ddljohn-- I think that motivation is the desire to do something or accomplish something. In terms of job performance, it's the desire to do one's job well. I think that everyone who does their job must be motivated by something, or this wouldn't be possible.
I think that the biggest motivation affecting job performance is money. At the end of the day, we all need to make money. Not many people will do something that they love if they are not compensated for it. Competitive remuneration is very important for employee job performance and motivation.